The influences of a novel shear layer-spherulites layer alternated structure on the mechanical properties of injection-molded isotactic polypropylene

Hou, Fengyi; Mi, Dashan; Zhou, Man; Zhang, Jie

doi:10.1016/j.polymer.2017.06.035

Cited by 23 publications

(11 citation statements)

References 37 publications

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“…It is well established that product properties are also affected by matrix crystallization behaviors under the action of an external field. − DSC measurements were conducted to visualize the thermal property, and, herein, the melting curves and crystallization information of raw materials and each pipe layer are available in Figure and Table for comparison. Obviously, in contrast to the HDPE raw pellet, the GF/HDPE pellet has a higher melting temperature ( T m ) but a slightly lower crystallinity ( X c ).…”

Section: Resultsmentioning

confidence: 99%

Structure Evolution and Hoop-Reinforcing Mechanism of Bionic-Inspired Off-Axial Glass Fiber-Reinforced High-Density Polyethylene Pipes Fabricated via Rotating Co-extrusion

Hong

Chen

et al. 2021

Ind. Eng. Chem. Res.

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Triple-layer rotating co-extrusion is employed to fabricate hoop-enhanced polyethylene composite pipes with bionic off-axial glass fiber (GF)-reinforced high-density polyethylene (HDPE) middle layer. One kind of super-“hybrid shish-kebab”-like structures formed by GFs and interfacial lamellae tend to spirally align with a fiber deviation angle of 55.7° as the rotation rate reaches 20 rpm. Encouragingly, the hoop strength and hydraulic damage resistance are improved by 25.5 and 24.1%, respectively, even with a low fiber aspect ratio, which can be attributed to the enhanced hoop loading capacity and the energy dissipation effect of crack bifurcation contributed by deviated hybrid structures. Innovatively, the relationship between processing field and structure evolution has been systematically investigated by the simulation of melt flow track, shear rate, and flow rate, indicating that fiber deviation is closely related to the shear rate. This work develops a feasible strategy with both academic value and industrial application prospect for the hoop enhancement of fiber-reinforced HDPE pressure pipes and improves its adaptability to service requirements as well.

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Section: Resultsmentioning

confidence: 99%

Structure Evolution and Hoop-Reinforcing Mechanism of Bionic-Inspired Off-Axial Glass Fiber-Reinforced High-Density Polyethylene Pipes Fabricated via Rotating Co-extrusion

Hong

Chen

et al. 2021

Ind. Eng. Chem. Res.

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“…The different fracture mechanisms of shish-kebab in shear layer and spherulite in core layer caused the observed layering phenomenon. That is, shish-kebab with polymer chains highly oriented along flow direction can withstand high-speed tensile deformation, which facilitates the absorption of more impact energy and induces more plastic deformation than spherulites [39]. As for VIM-10 and VIM-20, this layering phenomenon is prohibited due to the poor interfacial adhesion.…”

Section: Resultsmentioning

confidence: 99%

New Approach to Optimize Mechanical Properties of the Immiscible Polypropylene/Poly (Ethylene Terephthalate) Blend: Effect of Shish-Kebab and Core-Shell Structure

Wang

Delva

et al. 2018

Polymers

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Improving the mechanical properties of immiscible PP/PET blend is of practical significance especially in the recycling process of multi-layered plastic solid waste. In this work, a multi-flow vibration injection molding technology (MFVIM) was hired to convert the crystalline morphology of the PP matrix from spherulite into shish-kebab. POE–g–MA was added as compatibilizer, and results showed that the compatibilization effect consisted in the formation of a core-shell structure by dispersing the POE–g–MA into the PP matrix to encapsulate the PET. It was found that the joint action of shish-kebab crystals and spherical core-shell structure enabled excellent mechanical performance with a balance of strength and toughness for samples containing 10 wt % PET and 4 wt % POE–g–MA, of which the yield strength and impact strengths were 50.87 MPa and 13.71 kJ/m2, respectively. This work demonstrates a new approach to optimize mechanical properties of immiscible PP/PET blends, which is very meaningful for the effective recycling of challenging plastic wastes.

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“…To date, many advanced polymer processing technologies/devices are being used to control the shear/elongated thermal fields and thus obtain the oriented structure, such as multiflow vibration injection molding (MFVIM), dynamic packing injection molding (DPIM), oscillation shear injection molding (OSIM), water-assisted injection molding (WAIM), melt multi-injection mold (MMIM), − solid-state drawing, and preshearing. , The mechanism of MFVIM is that after fully filling the mold during the filling stage, there are still several melt flows triggered by the vibration pressures, and at the same time, extra melt will be ejected from a designed flash groove during the packing stage. Detailed theory has published in refs , . In this work, the MFVIM technology is used to obtain the iPP/HDPE blend sample with a large amount of oriented structure.…”

Section: Introductionmentioning

confidence: 99%

Evolution of iPP/HDPE Morphology under Different Mold Temperatures via Multiflow Vibration Injection Molding: Thermal Field Simulation and Oriented Structures

Hong

Leng

et al. 2020

Ind. Eng. Chem. Res.

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To date, many advanced polymer processing technologies have been developed to tune the morphology of semicrystalline polymers, such as multiflow vibration injection molding (MFVIM). By adjusting the processing fields, i.e., shear and thermal fields, the material can be imparted with great mechanical properties, good electrical/thermal conductivity, or biomimic structure, by manipulating chain's orientation, crystal's arrangement, or hierarchical structure distribution. Despite the era of intelligent manufacturing approaching, there is rarely any report on the computer simulation of these advanced processing technologies. In this work, the processing fields of the MFVIM isotactic polypropylene/high-density polyethylene (iPP/ HDPE) part are successfully simulated using Moldflow by designing a special model. Different thermal gradients can be realized in the plate part by setting different mold temperatures. The experimental results correlate well with the simulation results, and both of them illustrate that the mold temperature plays an important role in the morphology of dispersed PE phase resulting in different physical properties.

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The influences of a novel shear layer-spherulites layer alternated structure on the mechanical properties of injection-molded isotactic polypropylene

Cited by 23 publications

References 37 publications

Structure Evolution and Hoop-Reinforcing Mechanism of Bionic-Inspired Off-Axial Glass Fiber-Reinforced High-Density Polyethylene Pipes Fabricated via Rotating Co-extrusion

Structure Evolution and Hoop-Reinforcing Mechanism of Bionic-Inspired Off-Axial Glass Fiber-Reinforced High-Density Polyethylene Pipes Fabricated via Rotating Co-extrusion

New Approach to Optimize Mechanical Properties of the Immiscible Polypropylene/Poly (Ethylene Terephthalate) Blend: Effect of Shish-Kebab and Core-Shell Structure

Evolution of iPP/HDPE Morphology under Different Mold Temperatures via Multiflow Vibration Injection Molding: Thermal Field Simulation and Oriented Structures

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